string density_sketch::to_string()

in density/include/density_sketch_impl.hpp [420:465]

• 42 lines of code
• 10 McCabe index (conditional complexity)

string<A> density_sketch<T, K, A>::to_string(bool print_levels, bool print_items) const {
  // Using a temporary stream for implementation here does not comply with AllocatorAwareContainer requirements.
  // The stream does not support passing an allocator instance, and alternatives are complicated.
  std::ostringstream os;
  os << "### Density sketch summary:" << std::endl;
  os << "   K              : " << k_ << std::endl;
  os << "   Dim            : " << dim_ << std::endl;
  os << "   Empty          : " << (is_empty() ? "true" : "false") << std::endl;
  os << "   N              : " << n_ << std::endl;
  os << "   Retained items : " << num_retained_ << std::endl;
  os << "   Estimation mode: " << (is_estimation_mode() ? "true" : "false") << std::endl;
  os << "   Levels         : " << levels_.size() << std::endl;
  os << "### End sketch summary" << std::endl;

  if (print_levels) {
    os << "### Density sketch levels:" << std::endl;
    os << "   height: size" << std::endl;
    for (unsigned height = 0; height < levels_.size(); ++height) {
      os << "   " << height << ": "
        << levels_[height].size() << std::endl;
    }
    os << "### End sketch levels" << std::endl;
  }

  if (print_items) {
    os << "### Density sketch data:" << std::endl;
    for (unsigned height = 0; height < levels_.size(); ++height) {
      os << " level " << height << ": " << std::endl;
      for (const auto& point: levels_[height]) {
        os << "   [";
        bool first = true;
        for (auto value: point) {
          if (first) {
            first = false;
          } else {
            os << ", ";
          }
          os << value;
        }
        os << "]" << std::endl;
      }
    }
    os << "### End sketch data" << std::endl;
  }
  return string<A>(os.str().c_str(), levels_.get_allocator());
}